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xy-tuples (Read 658 times)
22samurai
xy-tuples
Oct 19th, 2006, 5:28am  
what would be nice is a built-in datatype that represents a single x and y value.  Then arrays of this xy-tuple could be manipulated as one variable in arrays, rect() corners, line() coordinates, etc.  This would permit the easier manipulation of x and y variables, while maintaining the x and y values.
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grnkestrel  
JohnG
Re: xy-tuples
Reply #1 - Oct 19th, 2006, 11:19am  
This is what classes are good for, defining your own complex data types.

Code:
class xy
{
  float x,y;
  xy(float _x, float _y)
  {
    x=_x;
    y=_y;
  }
}


You can then overload rect/line yourself:

Code:
void rect(xy topleft, xy bottomright)
{
  rect(topleft.x,topleft.y,bottomright.x,bottomright.y);
}
void line(xy start, xy end)
{
  line(start.x,start.y,end.x,end.y);
}
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22samurai
Re: xy-tuples
Reply #2 - Oct 19th, 2006, 4:17pm  
JohnG, thanks for the great example.  

I know writing this is easy to do; I seem to write this kind of class with every other Processing project I work on.  It would just be nice if this was a "value-added" data structure in processing.  Processing has a color datatype (which is from  Java), so why not an xy-tuple?
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grnkestrel  
JohnG
Re: xy-tuples
Reply #3 - Oct 19th, 2006, 4:26pm  
Processing's color datatype isn't actually a datatype. Color is just another name for int.
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fry
Re: xy-tuples
Reply #4 - Oct 19th, 2006, 6:47pm  
you can use Point and Point2D.Float from java to do this.

Code:

Point p = new Point(50, 20);
line(p.x, p.y, width, height);


or if you want floats:

Code:

import java.awt.geom.*;

Point2D.Float p = new Point2D.Float(50, 20);
line(p.x, p.y, width, height);


we don't have a special PPoint class because 1) you can get this straight from java, so there's no need and 2) using objects for very simple things like this creates a lot of overhead. this is what slows down java2d a lot, because it encourages a style of programming where you create a lot of small, temporary objects.
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